אמר לה הקב"ה בתי י"ב מזלות בראתי ברקיע ועל כל מזל ומזל בראתי לו שלשים חיל ועל כל חיל וחיל בראתי לו שלשים לגיון ועל כל לגיון ולגיון בראתי לו שלשים רהטון ועל כל רהטון ורהטון בראתי לו שלשים קרטון ועל כל קרטון וקרטון בראתי לו שלשים גסטרא ועל כל גסטרא וגסטרא תליתי בו שלש מאות וששים וחמשה אלפי רבוא כוכבים כנגד ימות החמה וכולן לא בראתי אלא בשבילךBabylonian Talmud, Brachot 32b
My daughter, twelve constellations have I created in the firmament, and for each constellation I have created thirty hosts, and for each host I have created thirty legions, and for each legion I have created thirty cohorts, and for each cohort I have created thirty maniples, and for each maniple I have created thirty camps, and to each campI have attached three hundred and sixty-five thousands of myriads of stars, corresponding to the days of the solar year, and all of them I have created only for thy sake...
Multiplying these numbers gives a value of about 1 x 1018 for the number of stars in the quote above.
The late Carl Sagan is known for his famous "billions and billions" quote and there are probably more than 170 billion galaxies in the observable Universe. If you multiply the number of stars in our galaxy by the number of galaxies in the Universe, you get approximately 1024 stars. That’s a septillion stars. Of course no knows for sure, still the Chazal's quoted number of 1 x 1018 looks very reasonable.
It’s been calculated that the observable Universe is a bubble of space 47 billion years in all directions. It defines the amount of the Universe that can be seen, because that’s how long light has taken to reach us since the Big Bang. This is a minimum value, the Universe could be much bigger. It’s even possible that the Universe is infinite, stretching on forever, with an infinite amount of stars. So add a couple more zeros. Maybe an infinite number of zeroes.
The Mishnah (Uktzin 3:12 - the concluding mishnah of Shas) states that "in the future Hashem will cause each tzaddik to inherit 310 worlds." These are understood to be spiritual realms (R. Shmuel of Lubavitch, Maamar Shabchi Yerushalayim 5627); but since the physical is an outgrowth of the spiritual, it may well be that there is actual physical "real estate" involved, from which they can derive benefit. (Even nowadays the idea is sometimes floated to extract natural resources from the moon, asteroids, etc.)
So those trillions of galaxies, etc., may simply be waiting for their rightful claimants!
Read more: http://www.universetoday.com/102630/how-many-stars-are-there-in-the-universe/#ixzz30oMxQ8KK
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